Yes, with the flooding epidemic subsiding more and more, you will continue to see HDD's drop and even rise in price from time to time. The price will fluctuate until everything is 100% completely back to normal.
Go down in price for a 2TB drive in an iMac? I never noticed Apple charging more than they usually do to have a 2TB drive BTO into an iMac. It's $150 for the non-discounted price now, how much was it before the floods?